iPhone Not Charging
iPhone Not Charging

Have you ever plugged your phone in to charge and noticed that the battery percentage is actually going down instead of up? It’s a perplexing and frustrating experience, but there are several reasons why this could be happening. In this article, we’ll explore the various causes and offer solutions to get your phone back to charging normally.

Understanding the Basics of Phone Charging

Before diving into the specific reasons for a draining battery during charging, it’s important to understand the basics of how phone charging works. Your phone’s battery receives power through the charging port, which is regulated by a sub-board. This power then replenishes the battery’s charge.

1. Issues with the Sub-Board

A significant reason for battery drain during charging could be a malfunctioning sub-board. The sub-board is integral to the charging process as it connects the charging port to the rest of the phone. Problems like overcharging, overheating, and voltage fluctuations can damage this component.

2. Overheating Challenges

Overheating is a common culprit behind a draining battery. When your phone gets too hot, it may drain the battery faster than it can charge. This overheating can occur if you’re using the phone while it’s charging or if it’s in a very warm environment.

2.1. Minimizing Overheating

To prevent overheating:

  • Avoid using your phone while it’s charging.
  • Keep it away from high temperatures.

3. The Role of Usage and Software

Sometimes, the issue isn’t with the hardware but how the phone is being used. Heavy app usage or a software glitch can lead to your phone using more power than it can take in, leading to a net loss in battery charge even when plugged in.

3.1. Managing Your Phone’s Resources

To mitigate this, try:

  • Reducing screen brightness.
  • Closing unnecessary apps.
  • Updating your phone’s software.

4. The Importance of Quality Cables

Faulty charging cables are a common issue. A cable might look fine on the outside but could be damaged internally. This damage can prevent your phone from charging properly or at all.

4.1. Choosing the Right Cable

To ensure efficient charging:

  • Regularly inspect your cables for damage.
  • Avoid using cheap, third-party chargers.

5. Power Supply Problems

Inadequate power supply is another reason your phone’s battery might be draining while connected to a charger. This is particularly true for fast-charging phones that require a specific adapter to charge efficiently.

5.1. Ensuring Adequate Power

To address this:

  • Use the original charger or a certified replacement.
  • Check the power output of your charging adapter.

6. Dealing with a Faulty Battery

Sometimes, the problem lies with the battery itself. Over time, phone batteries degrade and lose their ability to hold a charge effectively.

6.1. Identifying Battery Issues

Signs of a faulty battery include:

  • The phone dying quickly even after a full charge.
  • The battery percentage jumping erratically.

7. Software-Related Concerns

Software glitches can also cause issues with charging. These glitches might misrepresent the actual battery level or interfere with the charging process.

7.1. Tackling Software Issues

To fix software glitches:

  • Restart your phone.
  • Perform a factory reset (after backing up your data).

8. External Factors

External factors like the temperature of the environment, the age of the phone, and the presence of malware can also affect charging.

8.1. Controlling External Factors

To manage these:

  • Keep your phone in a cool, dry place.
  • Regularly scan for malware.

9. The Charging Port

A dirty or damaged charging port can prevent the charger from making good contact, leading to inefficient charging.

9.1. Maintaining the Charging Port

To maintain the port:

  • Clean it gently with a toothpick or small brush.
  • Avoid exposing the port to dust and debris.

10. Background Processes

Background processes, especially those that are resource-intensive, can drain the battery faster than it charges.

10.1. Managing Background Processes

To control these processes:

  • Check for apps running in the background.
  • Disable unnecessary background data usage.


A phone’s battery draining while it’s charging can be due to a variety of reasons, from hardware issues like a faulty sub-board or charging cable, to software glitches and heavy usage. By understanding these causes and taking proactive steps, you can ensure that your phone charges efficiently and maintains its battery health.


  1. What should I do if my phone overheats while charging?
    • Stop charging, let it cool down, and remove any cases that might be trapping heat.
  2. Can a software update fix charging issues?
    • Yes, software updates can resolve bugs that may affect charging.
  3. Is it bad to use my phone while it’s charging?
    • It’s best to avoid heavy use while charging, as this can cause overheating and slow down charging.
  4. How can I tell if my charging cable is faulty?
    • Look for physical damage or try using another cable to see if the issue persists.
  5. Should I replace my phone’s battery if it’s draining while charging?
    • If the battery is old or showing signs of wear, replacing it might be necessary.
Eric Chan

Hi! I’m Eric and I work on the knowledge base at GadgetMates.com.  You can see some of my writings about technology, cellphone repair, and computer repair here.

When I’m not writing about tech I’m playing with my dog or hanging out with my girlfriend.

Shoot me a message at ericchan@gadgetmates.com if you want to see a topic discussed or have a correction on something I’ve written.

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